CVE-2025-38460 atm: clip: Fix potential null-ptr-deref in to_atmarpd().

What is CVE-2025-38460?

CVE-2025-38460 is a high-severity vulnerability in Debian Debian Linux, published on 25 Jul 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

atm: clip: Fix potential null-ptr-deref in to_atmarpd().

atmarpd is protected by RTNL since commit f3a0592b37b8 ("[ATM]: clip causes unregister hang").

However, it is not enough because to_atmarpd() is called without RTNL, especially clip_neigh_solicit() / neigh_ops->solicit() is unsleepable.

Also, there is no RTNL dependency around atmarpd.

Let's use a private mutex and RCU to protect access to atmarpd in to_atmarpd().

Weakness: CWE-476

Which versions are affected by CVE-2025-38460?

It affects 2 products.

Products include Debian Debian Linux, Linux kernel.

How do I fix CVE-2025-38460?

Apply the vendor's patch.

Is CVE-2025-38460 being exploited?

There is no known exploitation of CVE-2025-38460 in the wild and no public exploit code.

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All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-65819, AZL-72944, BELL-CVE-2025-38460, DEBIAN-CVE-2025-38460, GHSA-vvp3-76jq-q4c4, ROOT-OS-DEBIAN-11-CVE-2025-38460 and 3 more.